Sewing-machine



(No Model.) Z-Sheets-Shegt 1.

L. B. MILLER & P. D'I-EHL.

SEWING MACHINE.

No. 275,402, Patented Apr. 10,1883.

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(No Model.) 2 Sheets- Sheet 2.

L. B.MILLERQ &' P. DIEHL. SEWING MAGHINE.

No. 275,402; Patented AplfllO, 1883.

WITNESSES WMWI/ UNITED: STATES I PATENT OFFICE.

LEBBEUS B. MILLER AND PHILIP DIEHL, OF ELIZABETH, NEW JERSEY, AS- SIGNQBS TO THE, SINGER MANUFACTURING COMPANY OF NEW JERSEY. 7

SEWING-MACHINE.

SEEGIFIGAT ION forming'part of Letters Patent No. 275,402, dated April 10, 1883.

l Application filed May12,1882. (No model.) 7

To all whom it may concern:

Be it known that we, LEBBEUS BALDWIN MILLER and PHILIP DIEHL, both of Elizabeth, in the county of Union andState of New Jersey, have made an invention of certain new and usefullmprovements in Sewing-Machines and we do hereby declare that the following is a full, clear, and exact description and specification of thesame.

Our invention is especially applicable to single-thread or chain-stitch sewing-machines, and its objects are to provide a simple, durable, and efficient mechanism for producing what is knownjas'the twisted chain-stitch, and also top'rovide means for simultaneously sewing two or more seams and varying andadjusting thesame so as to increase or decrease the distances between such seams.

In the drawings, Figure 1 represents a side view of the frame of a sewing-machine with the mechanism through which the needle-bar and the hook or looper receive their respective motions. Fig.2-is an under view of the same machine, illustrating the looper-driving mechanism; and Figs.3 to 6, inclusive, are enlarged detail views of the hook or looper, showing its construction, modes of attachment and adjustment'and of operation, Figs. 3 and 4showing especially a loop over the hook, held open in the notch 12*, the hook being on its forward motion and ready to enter the next loop, and Figs. 5 and 6 showing the hook on its return movement, the deflected point e havin g'caught the side of the loop.

The usual vertical'reciprocating motion is given to the needle-bar (and consequently to the needle) from the main driving-shaft A preferably by means of a crank on said shaft, with which the bar is directly connected by a link; but our invention can be effectively and advantageously applied and used if a reciprocating motion be obtained by any of the methods commonly used in sewing-machines. The looper we drive as follows: A portion of the main shaft A, bent to form a crank, carries the connecting-rod B. The rock-shaft C, hung in bearings c c ,is provided with an arm, 0, to which arm, near said rock-shaft, as shown in Figs.1 and 2, this connecting-rod B is pivoted. A link, 0, is pivoted to. the outer end of said arm 0, and the other end of this link is pivoted to the crank d of the looper rock-shaft D. As the main driving-shaft revolves, an oscillating motion is communicated to the arm 0, and by means of the link 0 and crank d an increased oscillating motion is given to the parallel rockshaft D, which, turning in its bearings (1 d,

serves to drive the looper. By making the arm a longer than the crank d, and also longer than the distance between the centers of the shafts O and D, we can obtain in the rock shaft D an increased oscillation, being a little more than half of a revolution alternately in each direction, which we find advantageous and important in properly forming the twisted chain-stitch. As the rock-shaft G can also be used to give the lifting and falling movements to such a feed as is shown in Letters Patent- N 0. 229,629, issued to us July 6,1880, we have retained it, although it is evident that the same result can be obtained by pivoting the arm a to a lug or projection, and using it as a lever of the third class.

The twisted chain-stitch is formed'in the following manner: As the needle, having reached its lowest point, begins its ascent and forms a loop, the hook or looper E, being then on its forward movement, asin Figs.3 and 4, catches this loop on its point e, and, continuing such movement, carries it down until the point e of said looper E also passes throughthe loop. The looper then commences its return movement, and as its point e is bent or deflected beyond the line of the descent of the needle, or out of the plane of motion of the point e, which takes the loop from theneedle, (see Fig. 5,) it 7 6 and as this ensuing loop is drawn down by 9 the point 0 through the loop first caught and twisted, the said first loop escapes over the point e, is drawn up, and the stitch thus completed. In order to multiply seams of this character without adding to or changing-the driving mechanism, and by addition only of a needle-clamp and needles and loopers to correspond with the number of seams required, we simply extend the bar (1 which carries the looper, and securethe required number of loopers thereon by the set-screws, as shown. This method of securing the looper or loopers enables us to adjust them in any desired position, and, by making a corresponding adjustment of the needles, to regulate at will the distances between the seams.

Ve claim as our invention- 1. A sewing-machine looper having two points, one adapted to take the loop directly from the needle and the other bent or deflected, substantially as described, to take and twist said loop on the return movement ofsaid looper.

2. A sewingmachine looper having two points, one adapted to take the loop directly 20 from the needle and the other, bent or deflected, substantially as described, to take and twist said loop on the return movement of said looper, and provided with actuating mechanism, substantially as described, whereby it 2 5 receives an oscillating movement.

LEBBEUS BALDWIN MILLER. PHILIP DIEHL.

Witnesses:

'l. E. HARDENBERG-H, JNO. Scorr. 

